“枚举"有什么用?在爪哇? [英] What's the use of "enum" in Java?

问题描述

所以我研究了这个枚举"类型，对我来说它有点像一个美化的array/ArrayList/List.它的具体用途是什么?

So I looked into this "enum" type, and it kind of seems like a glorified array/ArrayList/List to me. What exactly is the use of it?

推荐答案

Enum 作为一种固定数量的常量，至少可以用于两件事

Enum serves as a type of fixed number of constants and can be used at least for two things

恒定

public enum Month {
    JANUARY, FEBRUARY, ...
}

这比创建一堆整数常量要好得多.

This is much better than creating a bunch of integer constants.

创建单例

public enum Singleton {
    INSTANCE

   // init
};

你可以用枚举做一些非常有趣的事情，看看这里

You can do quite interesting things with enums, look at here

另看官方文档

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